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Bioaerosols and Water Problems

This article is a compilation of frequently asked questions about Indoor Air Quality (IAQ). As are all FAQs, this is an evolving FAQ section. This is particularly true in the field of indoor air quality, where there are few hard facts and many questions unanswered. Where it exists, this FAQ expresses the consensus of scientific opinion. Where it does not, it should be understood, these FAQs are an expression of the opinion of the author.

Author: Richard R. Byrd, Director of Indoor Air Quality Investigations, Machado Environmental Corp., Glendale, Calif. USA


  • How does moisture contribute to IAQ problems?

    Many IAQ problems begin with moisture problems: rain leaks, floods, or excessive humidity. When this occurs, explosive growth of dust mites, mold, bacteria, and other micro-organisms can occur. Many people are allergic to dust mites and mold. Some molds and bacteria are toxigenic (capable of being poisonous). Rarely, molds and bacteria growing in the environment can also be infectious.
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  • What are bioaerosols?

    A bioaerosol is something airborne which is a living thing; was living; or was a product of something living. Examples are viruses, bacteria, mold spores, algae, yeasts, protozoa, pollen, dust mite allergens, cat allergens, dog allergens, cockroach parts, rodent hairs and excrement, pigeon excrement, etc. All of these listed, by the way, can affect people's health.